includes/api/ApiHelp.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on Aug 29, 2014
   6  *
   7  * Copyright © 2014 Brad Jorsch <bjorsch@wikimedia.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  */
  26
  27 /**
  28  * Class to output help for an API module
  29  *
  30  * @since 1.25 completely rewritten
  31  * @ingroup API
  32  */
  33 class ApiHelp extends ApiBase {
  34         public function execute() {
  35                 $params = $this->extractRequestParams();
  36                 $modules = array();
  37
  38                 foreach ( $params['modules'] as $path ) {
  39                         $modules[] = $this->getModuleFromPath( $path );
  40                 }
  41
  42                 // Get the help
  43                 $context = new DerivativeContext( $this->getMain()->getContext() );
  44                 $context->setSkin( SkinFactory::getDefaultInstance()->makeSkin( 'apioutput' ) );
  45                 $context->setLanguage( $this->getMain()->getLanguage() );
  46                 $context->setTitle( SpecialPage::getTitleFor( 'ApiHelp' ) );
  47                 $out = new OutputPage( $context );
  48                 $out->setCopyrightUrl( 'https://www.mediawiki.org/wiki/Special:MyLanguage/Copyright' );
  49                 $context->setOutput( $out );
  50
  51                 self::getHelp( $context, $modules, $params );
  52
  53                 // Grab the output from the skin
  54                 ob_start();
  55                 $context->getOutput()->output();
  56                 $html = ob_get_clean();
  57
  58                 $result = $this->getResult();
  59                 if ( $params['wrap'] ) {
  60                         $data = array(
  61                                 'mime' => 'text/html',
  62                                 'help' => $html,
  63                         );
  64                         ApiResult::setSubelementsList( $data, 'help' );
  65                         $result->addValue( null, $this->getModuleName(), $data );
  66                 } else {
  67                         $result->reset();
  68                         $result->addValue( null, 'text', $html, ApiResult::NO_SIZE_CHECK );
  69                         $result->addValue( null, 'mime', 'text/html', ApiResult::NO_SIZE_CHECK );
  70                 }
  71         }
  72
  73         /**
  74          * Generate help for the specified modules
  75          *
  76          * Help is placed into the OutputPage object returned by
  77          * $context->getOutput().
  78          *
  79          * Recognized options include:
  80          *  - headerlevel: (int) Header tag level
  81          *  - nolead: (bool) Skip the inclusion of api-help-lead
  82          *  - noheader: (bool) Skip the inclusion of the top-level section headers
  83          *  - submodules: (bool) Include help for submodules of the current module
  84          *  - recursivesubmodules: (bool) Include help for submodules recursively
  85          *  - helptitle: (string) Title to link for additional modules' help. Should contain $1.
  86          *  - toc: (bool) Include a table of contents
  87          *
  88          * @param IContextSource $context
  89          * @param ApiBase[]|ApiBase $modules
  90          * @param array $options Formatting options (described above)
  91          * @return string
  92          */
  93         public static function getHelp( IContextSource $context, $modules, array $options ) {
  94                 global $wgContLang;
  95
  96                 if ( !is_array( $modules ) ) {
  97                         $modules = array( $modules );
  98                 }
  99
 100                 $out = $context->getOutput();
 101                 $out->addModules( 'mediawiki.apihelp' );
 102                 if ( !empty( $options['toc'] ) ) {
 103                         $out->addModules( 'mediawiki.toc' );
 104                 }
 105                 $out->setPageTitle( $context->msg( 'api-help-title' ) );
 106
 107                 $cache = ObjectCache::getMainWANInstance();
 108                 $cacheKey = null;
 109                 if ( count( $modules ) == 1 && $modules[0] instanceof ApiMain &&
 110                         $options['recursivesubmodules'] && $context->getLanguage() === $wgContLang
 111                 ) {
 112                         $cacheHelpTimeout = $context->getConfig()->get( 'APICacheHelpTimeout' );
 113                         if ( $cacheHelpTimeout > 0 ) {
 114                                 // Get help text from cache if present
 115                                 $cacheKey = wfMemcKey( 'apihelp', $modules[0]->getModulePath(),
 116                                         (int)!empty( $options['toc'] ),
 117                                         str_replace( ' ', '_', SpecialVersion::getVersion( 'nodb' ) ) );
 118                                 $cached = $cache->get( $cacheKey );
 119                                 if ( $cached ) {
 120                                         $out->addHTML( $cached );
 121                                         return;
 122                                 }
 123                         }
 124                 }
 125                 if ( $out->getHTML() !== '' ) {
 126                         // Don't save to cache, there's someone else's content in the page
 127                         // already
 128                         $cacheKey = null;
 129                 }
 130
 131                 $options['recursivesubmodules'] = !empty( $options['recursivesubmodules'] );
 132                 $options['submodules'] = $options['recursivesubmodules'] || !empty( $options['submodules'] );
 133
 134                 // Prepend lead
 135                 if ( empty( $options['nolead'] ) ) {
 136                         $msg = $context->msg( 'api-help-lead' );
 137                         if ( !$msg->isDisabled() ) {
 138                                 $out->addHTML( $msg->parseAsBlock() );
 139                         }
 140                 }
 141
 142                 $haveModules = array();
 143                 $html = self::getHelpInternal( $context, $modules, $options, $haveModules );
 144                 if ( !empty( $options['toc'] ) && $haveModules ) {
 145                         $out->addHTML( Linker::generateTOC( $haveModules, $context->getLanguage() ) );
 146                 }
 147                 $out->addHTML( $html );
 148
 149                 $helptitle = isset( $options['helptitle'] ) ? $options['helptitle'] : null;
 150                 $html = self::fixHelpLinks( $out->getHTML(), $helptitle, $haveModules );
 151                 $out->clearHTML();
 152                 $out->addHTML( $html );
 153
 154                 if ( $cacheKey !== null ) {
 155                         $cache->set( $cacheKey, $out->getHTML(), $cacheHelpTimeout );
 156                 }
 157         }
 158
 159         /**
 160          * Replace Special:ApiHelp links with links to api.php
 161          *
 162          * @param string $html
 163          * @param string|null $helptitle Title to link to rather than api.php, must contain '$1'
 164          * @param array $localModules Keys are modules to link within the current page, values are ignored
 165          * @return string
 166          */
 167         public static function fixHelpLinks( $html, $helptitle = null, $localModules = array() ) {
 168                 $formatter = new HtmlFormatter( $html );
 169                 $doc = $formatter->getDoc();
 170                 $xpath = new DOMXPath( $doc );
 171                 $nodes = $xpath->query( '//a[@href][not(contains(@class,\'apihelp-linktrail\'))]' );
 172                 foreach ( $nodes as $node ) {
 173                         $href = $node->getAttribute( 'href' );
 174                         do {
 175                                 $old = $href;
 176                                 $href = rawurldecode( $href );
 177                         } while ( $old !== $href );
 178                         if ( preg_match( '!Special:ApiHelp/([^&/|#]+)((?:#.*)?)!', $href, $m ) ) {
 179                                 if ( isset( $localModules[$m[1]] ) ) {
 180                                         $href = $m[2] === '' ? '#' . $m[1] : $m[2];
 181                                 } elseif ( $helptitle !== null ) {
 182                                         $href = Title::newFromText( str_replace( '$1', $m[1], $helptitle ) . $m[2] )
 183                                                 ->getFullUrl();
 184                                 } else {
 185                                         $href = wfAppendQuery( wfScript( 'api' ), array(
 186                                                 'action' => 'help',
 187                                                 'modules' => $m[1],
 188                                         ) ) . $m[2];
 189                                 }
 190                                 $node->setAttribute( 'href', $href );
 191                                 $node->removeAttribute( 'title' );
 192                         }
 193                 }
 194
 195                 return $formatter->getText();
 196         }
 197
 198         /**
 199          * Wrap a message in HTML with a class.
 200          *
 201          * @param Message $msg
 202          * @param string $class
 203          * @param string $tag
 204          * @return string
 205          */
 206         private static function wrap( Message $msg, $class, $tag = 'span' ) {
 207                 return Html::rawElement( $tag, array( 'class' => $class ),
 208                         $msg->parse()
 209                 );
 210         }
 211
 212         /**
 213          * Recursively-called function to actually construct the help
 214          *
 215          * @param IContextSource $context
 216          * @param ApiBase[] $modules
 217          * @param array $options
 218          * @param array &$haveModules
 219          * @return string
 220          */
 221         private static function getHelpInternal( IContextSource $context, array $modules,
 222                 array $options, &$haveModules
 223         ) {
 224                 $out = '';
 225
 226                 $level = empty( $options['headerlevel'] ) ? 2 : $options['headerlevel'];
 227                 if ( empty( $options['tocnumber'] ) ) {
 228                         $tocnumber = array( 2 => 0 );
 229                 } else {
 230                         $tocnumber = &$options['tocnumber'];
 231                 }
 232
 233                 foreach ( $modules as $module ) {
 234                         $tocnumber[$level]++;
 235                         $path = $module->getModulePath();
 236                         $module->setContext( $context );
 237                         $help = array(
 238                                 'header' => '',
 239                                 'flags' => '',
 240                                 'description' => '',
 241                                 'help-urls' => '',
 242                                 'parameters' => '',
 243                                 'examples' => '',
 244                                 'submodules' => '',
 245                         );
 246
 247                         if ( empty( $options['noheader'] ) || !empty( $options['toc'] ) ) {
 248                                 $anchor = $path;
 249                                 $i = 1;
 250                                 while ( isset( $haveModules[$anchor] ) ) {
 251                                         $anchor = $path . '|' . ++$i;
 252                                 }
 253
 254                                 if ( $module->isMain() ) {
 255                                         $header = $context->msg( 'api-help-main-header' )->parse();
 256                                 } else {
 257                                         $name = $module->getModuleName();
 258                                         $header = $module->getParent()->getModuleManager()->getModuleGroup( $name ) .
 259                                                 "=$name";
 260                                         if ( $module->getModulePrefix() !== '' ) {
 261                                                 $header .= ' ' .
 262                                                         $context->msg( 'parentheses', $module->getModulePrefix() )->parse();
 263                                         }
 264                                 }
 265                                 $haveModules[$anchor] = array(
 266                                         'toclevel' => count( $tocnumber ),
 267                                         'level' => $level,
 268                                         'anchor' => $anchor,
 269                                         'line' => $header,
 270                                         'number' => join( '.', $tocnumber ),
 271                                         'index' => false,
 272                                 );
 273                                 if ( empty( $options['noheader'] ) ) {
 274                                         $help['header'] .= Html::element( 'h' . min( 6, $level ),
 275                                                 array( 'id' => $anchor, 'class' => 'apihelp-header' ),
 276                                                 $header
 277                                         );
 278                                 }
 279                         } else {
 280                                 $haveModules[$path] = true;
 281                         }
 282
 283                         $links = array();
 284                         $any = false;
 285                         for ( $m = $module; $m !== null; $m = $m->getParent() ) {
 286                                 $name = $m->getModuleName();
 287                                 if ( $name === 'main_int' ) {
 288                                         $name = 'main';
 289                                 }
 290
 291                                 if ( count( $modules ) === 1 && $m === $modules[0] &&
 292                                         !( !empty( $options['submodules'] ) && $m->getModuleManager() )
 293                                 ) {
 294                                         $link = Html::element( 'b', null, $name );
 295                                 } else {
 296                                         $link = SpecialPage::getTitleFor( 'ApiHelp', $m->getModulePath() )->getLocalURL();
 297                                         $link = Html::element( 'a',
 298                                                 array( 'href' => $link, 'class' => 'apihelp-linktrail' ),
 299                                                 $name
 300                                         );
 301                                         $any = true;
 302                                 }
 303                                 array_unshift( $links, $link );
 304                         }
 305                         if ( $any ) {
 306                                 $help['header'] .= self::wrap(
 307                                         $context->msg( 'parentheses' )
 308                                                 ->rawParams( $context->getLanguage()->pipeList( $links ) ),
 309                                         'apihelp-linktrail', 'div'
 310                                 );
 311                         }
 312
 313                         $help['flags'] .= Html::openElement( 'div',
 314                                 array( 'class' => 'apihelp-block apihelp-flags' ) );
 315                         $msg = $context->msg( 'api-help-flags' );
 316                         if ( !$msg->isDisabled() ) {
 317                                 $help['flags'] .= self::wrap(
 318                                         $msg->numParams( count( $flags ) ), 'apihelp-block-head', 'div'
 319                                 );
 320                         }
 321                         $help['flags'] .= Html::openElement( 'ul' );
 322                         foreach ( $module->getHelpFlags() as $flag ) {
 323                                 $help['flags'] .= Html::rawElement( 'li', null,
 324                                         self::wrap( $context->msg( "api-help-flag-$flag" ), "apihelp-flag-$flag" )
 325                                 );
 326                         }
 327                         $sourceInfo = $module->getModuleSourceInfo();
 328                         if ( $sourceInfo ) {
 329                                 if ( isset( $sourceInfo['namemsg'] ) ) {
 330                                         $extname = $context->msg( $sourceInfo['namemsg'] )->text();
 331                                 } else {
 332                                         $extname = $sourceInfo['name'];
 333                                 }
 334                                 $help['flags'] .= Html::rawElement( 'li', null,
 335                                         self::wrap(
 336                                                 $context->msg( 'api-help-source', $extname, $sourceInfo['name'] ),
 337                                                 'apihelp-source'
 338                                         )
 339                                 );
 340
 341                                 $link = SpecialPage::getTitleFor( 'Version', 'License/' . $sourceInfo['name'] );
 342                                 if ( isset( $sourceInfo['license-name'] ) ) {
 343                                         $msg = $context->msg( 'api-help-license', $link, $sourceInfo['license-name'] );
 344                                 } elseif ( SpecialVersion::getExtLicenseFileName( dirname( $sourceInfo['path'] ) ) ) {
 345                                         $msg = $context->msg( 'api-help-license-noname', $link );
 346                                 } else {
 347                                         $msg = $context->msg( 'api-help-license-unknown' );
 348                                 }
 349                                 $help['flags'] .= Html::rawElement( 'li', null,
 350                                         self::wrap( $msg, 'apihelp-license' )
 351                                 );
 352                         } else {
 353                                 $help['flags'] .= Html::rawElement( 'li', null,
 354                                         self::wrap( $context->msg( 'api-help-source-unknown' ), 'apihelp-source' )
 355                                 );
 356                                 $help['flags'] .= Html::rawElement( 'li', null,
 357                                         self::wrap( $context->msg( 'api-help-license-unknown' ), 'apihelp-license' )
 358                                 );
 359                         }
 360                         $help['flags'] .= Html::closeElement( 'ul' );
 361                         $help['flags'] .= Html::closeElement( 'div' );
 362
 363                         foreach ( $module->getFinalDescription() as $msg ) {
 364                                 $msg->setContext( $context );
 365                                 $help['description'] .= $msg->parseAsBlock();
 366                         }
 367
 368                         $urls = $module->getHelpUrls();
 369                         if ( $urls ) {
 370                                 $help['help-urls'] .= Html::openElement( 'div',
 371                                         array( 'class' => 'apihelp-block apihelp-help-urls' )
 372                                 );
 373                                 $msg = $context->msg( 'api-help-help-urls' );
 374                                 if ( !$msg->isDisabled() ) {
 375                                         $help['help-urls'] .= self::wrap(
 376                                                 $msg->numParams( count( $urls ) ), 'apihelp-block-head', 'div'
 377                                         );
 378                                 }
 379                                 if ( !is_array( $urls ) ) {
 380                                         $urls = array( $urls );
 381                                 }
 382                                 $help['help-urls'] .= Html::openElement( 'ul' );
 383                                 foreach ( $urls as $url ) {
 384                                         $help['help-urls'] .= Html::rawElement( 'li', null,
 385                                                 Html::element( 'a', array( 'href' => $url ), $url )
 386                                         );
 387                                 }
 388                                 $help['help-urls'] .= Html::closeElement( 'ul' );
 389                                 $help['help-urls'] .= Html::closeElement( 'div' );
 390                         }
 391
 392                         $params = $module->getFinalParams( ApiBase::GET_VALUES_FOR_HELP );
 393                         $groups = array();
 394                         if ( $params ) {
 395                                 $help['parameters'] .= Html::openElement( 'div',
 396                                         array( 'class' => 'apihelp-block apihelp-parameters' )
 397                                 );
 398                                 $msg = $context->msg( 'api-help-parameters' );
 399                                 if ( !$msg->isDisabled() ) {
 400                                         $help['parameters'] .= self::wrap(
 401                                                 $msg->numParams( count( $params ) ), 'apihelp-block-head', 'div'
 402                                         );
 403                                 }
 404                                 $help['parameters'] .= Html::openElement( 'dl' );
 405
 406                                 $descriptions = $module->getFinalParamDescription();
 407
 408                                 foreach ( $params as $name => $settings ) {
 409                                         if ( !is_array( $settings ) ) {
 410                                                 $settings = array( ApiBase::PARAM_DFLT => $settings );
 411                                         }
 412
 413                                         $help['parameters'] .= Html::element( 'dt', null,
 414                                                 $module->encodeParamName( $name ) );
 415
 416                                         // Add description
 417                                         $description = array();
 418                                         if ( isset( $descriptions[$name] ) ) {
 419                                                 foreach ( $descriptions[$name] as $msg ) {
 420                                                         $msg->setContext( $context );
 421                                                         $description[] = $msg->parseAsBlock();
 422                                                 }
 423                                         }
 424
 425                                         // Add usage info
 426                                         $info = array();
 427
 428                                         // Required?
 429                                         if ( !empty( $settings[ApiBase::PARAM_REQUIRED] ) ) {
 430                                                 $info[] = $context->msg( 'api-help-param-required' )->parse();
 431                                         }
 432
 433                                         // Custom info?
 434                                         if ( !empty( $settings[ApiBase::PARAM_HELP_MSG_INFO] ) ) {
 435                                                 foreach ( $settings[ApiBase::PARAM_HELP_MSG_INFO] as $i ) {
 436                                                         $tag = array_shift( $i );
 437                                                         $info[] = $context->msg( "apihelp-{$path}-paraminfo-{$tag}" )
 438                                                                 ->numParams( count( $i ) )
 439                                                                 ->params( $context->getLanguage()->commaList( $i ) )
 440                                                                 ->params( $module->getModulePrefix() )
 441                                                                 ->parse();
 442                                                 }
 443                                         }
 444
 445                                         // Type documentation
 446                                         if ( !isset( $settings[ApiBase::PARAM_TYPE] ) ) {
 447                                                 $dflt = isset( $settings[ApiBase::PARAM_DFLT] )
 448                                                         ? $settings[ApiBase::PARAM_DFLT]
 449                                                         : null;
 450                                                 if ( is_bool( $dflt ) ) {
 451                                                         $settings[ApiBase::PARAM_TYPE] = 'boolean';
 452                                                 } elseif ( is_string( $dflt ) || is_null( $dflt ) ) {
 453                                                         $settings[ApiBase::PARAM_TYPE] = 'string';
 454                                                 } elseif ( is_int( $dflt ) ) {
 455                                                         $settings[ApiBase::PARAM_TYPE] = 'integer';
 456                                                 }
 457                                         }
 458                                         if ( isset( $settings[ApiBase::PARAM_TYPE] ) ) {
 459                                                 $type = $settings[ApiBase::PARAM_TYPE];
 460                                                 $multi = !empty( $settings[ApiBase::PARAM_ISMULTI] );
 461                                                 $hintPipeSeparated = true;
 462                                                 $count = ApiBase::LIMIT_SML2 + 1;
 463
 464                                                 if ( is_array( $type ) ) {
 465                                                         $count = count( $type );
 466                                                         $links = isset( $settings[ApiBase::PARAM_VALUE_LINKS] )
 467                                                                 ? $settings[ApiBase::PARAM_VALUE_LINKS]
 468                                                                 : array();
 469                                                         $type = array_map( function ( $v ) use ( $links ) {
 470                                                                 $ret = wfEscapeWikiText( $v );
 471                                                                 if ( isset( $links[$v] ) ) {
 472                                                                         $ret = "[[{$links[$v]}|$ret]]";
 473                                                                 }
 474                                                                 return $ret;
 475                                                         }, $type );
 476                                                         $i = array_search( '', $type, true );
 477                                                         if ( $i === false ) {
 478                                                                 $type = $context->getLanguage()->commaList( $type );
 479                                                         } else {
 480                                                                 unset( $type[$i] );
 481                                                                 $type = $context->msg( 'api-help-param-list-can-be-empty' )
 482                                                                         ->numParams( count( $type ) )
 483                                                                         ->params( $context->getLanguage()->commaList( $type ) )
 484                                                                         ->parse();
 485                                                         }
 486                                                         $info[] = $context->msg( 'api-help-param-list' )
 487                                                                 ->params( $multi ? 2 : 1 )
 488                                                                 ->params( $type )
 489                                                                 ->parse();
 490                                                         $hintPipeSeparated = false;
 491                                                 } else {
 492                                                         switch ( $type ) {
 493                                                                 case 'submodule':
 494                                                                         $groups[] = $name;
 495                                                                         if ( isset( $settings[ApiBase::PARAM_SUBMODULE_MAP] ) ) {
 496                                                                                 $map = $settings[ApiBase::PARAM_SUBMODULE_MAP];
 497                                                                                 ksort( $map );
 498                                                                                 $submodules = array();
 499                                                                                 foreach ( $map as $v => $m ) {
 500                                                                                         $submodules[] = "[[Special:ApiHelp/{$m}|{$v}]]";
 501                                                                                 }
 502                                                                         } else {
 503                                                                                 $submodules = $module->getModuleManager()->getNames( $name );
 504                                                                                 sort( $submodules );
 505                                                                                 $prefix = $module->isMain()
 506                                                                                         ? '' : ( $module->getModulePath() . '+' );
 507                                                                                 $submodules = array_map( function ( $name ) use ( $prefix ) {
 508                                                                                         return "[[Special:ApiHelp/{$prefix}{$name}|{$name}]]";
 509                                                                                 }, $submodules );
 510                                                                         }
 511                                                                         $count = count( $submodules );
 512                                                                         $info[] = $context->msg( 'api-help-param-list' )
 513                                                                                 ->params( $multi ? 2 : 1 )
 514                                                                                 ->params( $context->getLanguage()->commaList( $submodules ) )
 515                                                                                 ->parse();
 516                                                                         $hintPipeSeparated = false;
 517                                                                         // No type message necessary, we have a list of values.
 518                                                                         $type = null;
 519                                                                         break;
 520
 521                                                                 case 'namespace':
 522                                                                         $namespaces = MWNamespace::getValidNamespaces();
 523                                                                         $count = count( $namespaces );
 524                                                                         $info[] = $context->msg( 'api-help-param-list' )
 525                                                                                 ->params( $multi ? 2 : 1 )
 526                                                                                 ->params( $context->getLanguage()->commaList( $namespaces ) )
 527                                                                                 ->parse();
 528                                                                         $hintPipeSeparated = false;
 529                                                                         // No type message necessary, we have a list of values.
 530                                                                         $type = null;
 531                                                                         break;
 532
 533                                                                 case 'limit':
 534                                                                         if ( isset( $settings[ApiBase::PARAM_MAX2] ) ) {
 535                                                                                 $info[] = $context->msg( 'api-help-param-limit2' )
 536                                                                                         ->numParams( $settings[ApiBase::PARAM_MAX] )
 537                                                                                         ->numParams( $settings[ApiBase::PARAM_MAX2] )
 538                                                                                         ->parse();
 539                                                                         } else {
 540                                                                                 $info[] = $context->msg( 'api-help-param-limit' )
 541                                                                                         ->numParams( $settings[ApiBase::PARAM_MAX] )
 542                                                                                         ->parse();
 543                                                                         }
 544                                                                         break;
 545
 546                                                                 case 'integer':
 547                                                                         // Possible messages:
 548                                                                         // api-help-param-integer-min,
 549                                                                         // api-help-param-integer-max,
 550                                                                         // api-help-param-integer-minmax
 551                                                                         $suffix = '';
 552                                                                         $min = $max = 0;
 553                                                                         if ( isset( $settings[ApiBase::PARAM_MIN] ) ) {
 554                                                                                 $suffix .= 'min';
 555                                                                                 $min = $settings[ApiBase::PARAM_MIN];
 556                                                                         }
 557                                                                         if ( isset( $settings[ApiBase::PARAM_MAX] ) ) {
 558                                                                                 $suffix .= 'max';
 559                                                                                 $max = $settings[ApiBase::PARAM_MAX];
 560                                                                         }
 561                                                                         if ( $suffix !== '' ) {
 562                                                                                 $info[] =
 563                                                                                         $context->msg( "api-help-param-integer-$suffix" )
 564                                                                                                 ->params( $multi ? 2 : 1 )
 565                                                                                                 ->numParams( $min, $max )
 566                                                                                                 ->parse();
 567                                                                         }
 568                                                                         break;
 569
 570                                                                 case 'upload':
 571                                                                         $info[] = $context->msg( 'api-help-param-upload' )
 572                                                                                 ->parse();
 573                                                                         // No type message necessary, api-help-param-upload should handle it.
 574                                                                         $type = null;
 575                                                                         break;
 576
 577                                                                 case 'string':
 578                                                                 case 'text':
 579                                                                         // Displaying a type message here would be useless.
 580                                                                         $type = null;
 581                                                                         break;
 582                                                         }
 583                                                 }
 584
 585                                                 // Add type. Messages for grep: api-help-param-type-limit
 586                                                 // api-help-param-type-integer api-help-param-type-boolean
 587                                                 // api-help-param-type-timestamp api-help-param-type-user
 588                                                 // api-help-param-type-password
 589                                                 if ( is_string( $type ) ) {
 590                                                         $msg = $context->msg( "api-help-param-type-$type" );
 591                                                         if ( !$msg->isDisabled() ) {
 592                                                                 $info[] = $msg->params( $multi ? 2 : 1 )->parse();
 593                                                         }
 594                                                 }
 595
 596                                                 if ( $multi ) {
 597                                                         $extra = array();
 598                                                         if ( $hintPipeSeparated ) {
 599                                                                 $extra[] = $context->msg( 'api-help-param-multi-separate' )->parse();
 600                                                         }
 601                                                         if ( $count > ApiBase::LIMIT_SML1 ) {
 602                                                                 $extra[] = $context->msg( 'api-help-param-multi-max' )
 603                                                                         ->numParams( ApiBase::LIMIT_SML1, ApiBase::LIMIT_SML2 )
 604                                                                         ->parse();
 605                                                         }
 606                                                         if ( $extra ) {
 607                                                                 $info[] = join( ' ', $extra );
 608                                                         }
 609                                                 }
 610                                         }
 611
 612                                         // Add default
 613                                         $default = isset( $settings[ApiBase::PARAM_DFLT] )
 614                                                 ? $settings[ApiBase::PARAM_DFLT]
 615                                                 : null;
 616                                         if ( $default === '' ) {
 617                                                 $info[] = $context->msg( 'api-help-param-default-empty' )
 618                                                         ->parse();
 619                                         } elseif ( $default !== null && $default !== false ) {
 620                                                 $info[] = $context->msg( 'api-help-param-default' )
 621                                                         ->params( wfEscapeWikiText( $default ) )
 622                                                         ->parse();
 623                                         }
 624
 625                                         if ( !array_filter( $description ) ) {
 626                                                 $description = array( self::wrap(
 627                                                         $context->msg( 'api-help-param-no-description' ),
 628                                                         'apihelp-empty'
 629                                                 ) );
 630                                         }
 631
 632                                         // Add "deprecated" flag
 633                                         if ( !empty( $settings[ApiBase::PARAM_DEPRECATED] ) ) {
 634                                                 $help['parameters'] .= Html::openElement( 'dd',
 635                                                         array( 'class' => 'info' ) );
 636                                                 $help['parameters'] .= self::wrap(
 637                                                         $context->msg( 'api-help-param-deprecated' ),
 638                                                         'apihelp-deprecated', 'strong'
 639                                                 );
 640                                                 $help['parameters'] .= Html::closeElement( 'dd' );
 641                                         }
 642
 643                                         if ( $description ) {
 644                                                 $description = join( '', $description );
 645                                                 $description = preg_replace( '!\s*</([oud]l)>\s*<\1>\s*!', "\n", $description );
 646                                                 $help['parameters'] .= Html::rawElement( 'dd',
 647                                                         array( 'class' => 'description' ), $description );
 648                                         }
 649
 650                                         foreach ( $info as $i ) {
 651                                                 $help['parameters'] .= Html::rawElement( 'dd', array( 'class' => 'info' ), $i );
 652                                         }
 653                                 }
 654
 655                                 $help['parameters'] .= Html::closeElement( 'dl' );
 656                                 $help['parameters'] .= Html::closeElement( 'div' );
 657                         }
 658
 659                         $examples = $module->getExamplesMessages();
 660                         if ( $examples ) {
 661                                 $help['examples'] .= Html::openElement( 'div',
 662                                         array( 'class' => 'apihelp-block apihelp-examples' ) );
 663                                 $msg = $context->msg( 'api-help-examples' );
 664                                 if ( !$msg->isDisabled() ) {
 665                                         $help['examples'] .= self::wrap(
 666                                                 $msg->numParams( count( $examples ) ), 'apihelp-block-head', 'div'
 667                                         );
 668                                 }
 669
 670                                 $help['examples'] .= Html::openElement( 'dl' );
 671                                 foreach ( $examples as $qs => $msg ) {
 672                                         $msg = ApiBase::makeMessage( $msg, $context, array(
 673                                                 $module->getModulePrefix(),
 674                                                 $module->getModuleName(),
 675                                                 $module->getModulePath()
 676                                         ) );
 677
 678                                         $link = wfAppendQuery( wfScript( 'api' ), $qs );
 679                                         $help['examples'] .= Html::rawElement( 'dt', null, $msg->parse() );
 680                                         $help['examples'] .= Html::rawElement( 'dd', null,
 681                                                 Html::element( 'a', array( 'href' => $link ), "api.php?$qs" )
 682                                         );
 683                                 }
 684                                 $help['examples'] .= Html::closeElement( 'dl' );
 685                                 $help['examples'] .= Html::closeElement( 'div' );
 686                         }
 687
 688                         $subtocnumber = $tocnumber;
 689                         $subtocnumber[$level + 1] = 0;
 690                         $suboptions = array(
 691                                 'submodules' => $options['recursivesubmodules'],
 692                                 'headerlevel' => $level + 1,
 693                                 'tocnumber' => &$subtocnumber,
 694                                 'noheader' => false,
 695                         ) + $options;
 696
 697                         if ( $options['submodules'] && $module->getModuleManager() ) {
 698                                 $manager = $module->getModuleManager();
 699                                 $submodules = array();
 700                                 foreach ( $groups as $group ) {
 701                                         $names = $manager->getNames( $group );
 702                                         sort( $names );
 703                                         foreach ( $names as $name ) {
 704                                                 $submodules[] = $manager->getModule( $name );
 705                                         }
 706                                 }
 707                                 $help['submodules'] .= self::getHelpInternal(
 708                                         $context,
 709                                         $submodules,
 710                                         $suboptions,
 711                                         $haveModules
 712                                 );
 713                                 $numSubmodules = count( $submodules );
 714                         }
 715
 716                         $module->modifyHelp( $help, $suboptions, $haveModules );
 717
 718                         Hooks::run( 'APIHelpModifyOutput', array( $module, &$help, $suboptions, &$haveModules ) );
 719
 720                         $out .= join( "\n", $help );
 721                 }
 722
 723                 return $out;
 724         }
 725
 726         public function shouldCheckMaxlag() {
 727                 return false;
 728         }
 729
 730         public function isReadMode() {
 731                 return false;
 732         }
 733
 734         public function getCustomPrinter() {
 735                 $params = $this->extractRequestParams();
 736                 if ( $params['wrap'] ) {
 737                         return null;
 738                 }
 739
 740                 $main = $this->getMain();
 741                 $errorPrinter = $main->createPrinterByName( $main->getParameter( 'format' ) );
 742                 return new ApiFormatRaw( $main, $errorPrinter );
 743         }
 744
 745         public function getAllowedParams() {
 746                 return array(
 747                         'modules' => array(
 748                                 ApiBase::PARAM_DFLT => 'main',
 749                                 ApiBase::PARAM_ISMULTI => true,
 750                         ),
 751                         'submodules' => false,
 752                         'recursivesubmodules' => false,
 753                         'wrap' => false,
 754                         'toc' => false,
 755                 );
 756         }
 757
 758         protected function getExamplesMessages() {
 759                 return array(
 760                         'action=help'
 761                                 => 'apihelp-help-example-main',
 762                         'action=help&recursivesubmodules=1'
 763                                 => 'apihelp-help-example-recursive',
 764                         'action=help&modules=help'
 765                                 => 'apihelp-help-example-help',
 766                         'action=help&modules=query+info|query+categorymembers'
 767                                 => 'apihelp-help-example-query',
 768                 );
 769         }
 770
 771         public function getHelpUrls() {
 772                 return array(
 773                         'https://www.mediawiki.org/wiki/API:Main_page',
 774                         'https://www.mediawiki.org/wiki/API:FAQ',
 775                         'https://www.mediawiki.org/wiki/API:Quick_start_guide',
 776                 );
 777         }
 778 }